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<p>[QUOTE=&quot;mgmgmg75, post: 2715023, member: 75114&quot;]My experience is in the manufacture and subsequent of steel.&nbsp; Copper and other non-ferris metals are processed in the same manner, only on a smaller scale.&nbsp; That being said, I would think the processes today are much different than in the 1860&#039;s.&nbsp; </p><p>Steel is cast into ingots, cooled, then heated up again and moved into position in the rolling mill.&nbsp; The &quot;rolling mill&quot; consists of many sets of rollers, each station reducing thickness by a certain set amount.&nbsp; This &quot;rolling mill&quot; can be several city blocks long and consist of 20 or more mills.&nbsp; The picture below is only 7 mills in length.[ATTACH=full]613830[/ATTACH] I remember seeing an ingot moving very slowly, walking speed, and seeing the same ingot, via CCTV, moving at a very high rate of speed exiting the final rollers.[/QUOTE]</p><p><br /></p>

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